You can fly to London this afternoon ___you don't mind changing the plane for Pairs.A providedB unless C except D so far as ,这里是选A,请问“假如”不是用prividing that 和A有什么区别在用法上?

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You can fly to London this afternoon ___you don't mind changing the plane for Pairs.A provided
B unless C except D so far as ,这里是选A,请问“假如”不是用prividing that 和A有什么区别在用法上?

provided (that)是比较正式的表示条件的从句引导词,而providing
that相对没有那么正式,在用法上倒没有什么特别大的区别,其实这些词都是早期英语留下来的用法.